Spherical Aberration Can Be Corrected or Avoided in a Reflecting

question 211

Multiple Choice

Spherical aberration can be corrected or avoided in a reflecting telescope by

• A) grinding the mirror to a more accurate spherical curve.
• B) grinding the mirror to a parabolic shape.
• C) using light of only one color.
• D) grinding the mirror to an elliptical shape.

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Disbursements

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Cashier's Check

A check issued by a bank, drawn from its own funds and signed by a cashier or teller, guaranteeing payment to the payee.

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A law enacted in 1991 in the United States that restricts telemarketing and the use of automated telephone equipment.

Telephone Solicitation

The practice of contacting individuals by phone to promote services or products, often unsolicited.